"Avast security"

My Free downloaded Avast security system has shut down twice the first time I contacted your haelpline and it was sorted but it took for ever as I only have dial up internet and the person wanted me to take a computer fix at £109.00. This I did not want so the call was ended my Avast system has again shut down so I will not be taking the system full time unless you can do something to stop it shutting down on me